I had a Specialised Clutch SX blow off a rear Flow rim in the Alps this summer. An off-camber landing from 8-10" (yeah ", not '). Nothing major. The Stan's solution in it foamed massively on explosive decompression leaving the entire area (and me) "foamed".
I assumed the foaming was due to the washing-up liquid I used to help seat the tyre. I fitted a tube, and that night put a tube in the front as well, worrying about a similar front blow-off.
Last night - literally while riding along - the rear blew off again. This time a Chunky Monkey running tubeless fitted yesterday afternoon. Again lots of foam and colateral splatterage. The Chunky Monkey has been run tubeless on the same rim for a year at least with no issues.
Is the common factor the washing-up liquid? I know neither tyre is Tubeless or Tubeless Ready, but I'm having nightmares about it happening on the front/at speed etc.